【作者】 杨锁龙； 王晓方； 蒋春丽； 王怀胜； 赖新春；

【Author】 Suolong Yang;Xiaofang Wang;Chunli Jiang;Huaisheng Wang;Xinchun Lai;Science and Technology on Surface Physics and Chemistry Laboratory;

【机构】 表面物理与化学重点实验室；

【摘要】 金属离子掺杂由于可对量子点的结构、形貌尺寸和荧光性能产生明显的影响而广受关注^[1-4],但是关于III-V族量子点中最有代表性的In P量子点的掺杂合成以及荧光性能的文献报道还较少。本文采用文献^[4]的热注入法,选择离子半径与宿主阳离子(In³⁺)离子半径相近的金属离子（Li、Zn）进行掺杂,通过在醋酸铟中掺入不同摩尔比的醋酸锂、醋酸锌制成阳离子前驱体,在一定温度下与注入的有机磷源原位成核反应形成掺杂InP量子点。然后对合成的掺杂InP量子点进行结构、形貌尺寸、吸光谱和荧光谱的表征。研究结果表明,所合成的Li、Zn掺杂的In P量子点为球形、尺寸均匀,具有ZnS闪锌矿结构,采用TEM观察发现Li、Zn掺杂导致In P量子点的尺寸明显减小,但是对InP量子点具有明显的荧光增强效果。ICP成分测量发现掺杂InP量子点中Zn含量与前驱体配比接近,而Li的含量则很少。造成这种现象的原因可能与Zn、Li离子在In P量子点表面的结合力强弱程度有关。更多还原

【Abstract】 The doping of quantum dots(QDs) with metal ions, which has been a topic of intensive research interest recently, can obviously tune the optical properties of QDs. However, literatures on the doping of In P QDs are relatively scarce. In this paper, Li and Zn doped InP quantum dots are successfully synthesized via an in-situ nucleation doping approach, and then the effect from dopant and dopant concentration are investigated. As a result, as-synthesized Li and Zn doped In P QDs have narrow size distribution and good crystalline. The size decreased with the dopant concentration increase and resulted in a blue-shift on UV-vis absorption. The photoluminescence intensity of In P QDs is obviously enhanced by Li and Zn dopant because of the surface passivation of Li and Zn ions.更多还原